The spider in the photo is a false widow (Steatoda nobilis). A female, likely to stay put in her web & hiding place.

Are you sure that the other spiders are the same species? S nobilis can live in close proximity with Zygiella species (can be mistaken at a distance), it would be unusual (but not impossible) for their to be another adult also living in the porch...lots of adults would be unusual. Spiderlings are likely to disperse when still very small.

If you have any reservations, it would be best to remove her and relocate her outside/elsewhere. She is unlikely to pose a threat that is any worse than a bee/wasp sting, but insect & spider bites (venom apart) can lead to infections requiring antibiotics.

These spiders are usually up high in areas of busy footfall, out of reach of toddlers, they can move quite quickly when trying to escape a threat. But better safe than sorry. If she proves very difficult to catch, you may decide that it's safer to leave her be, rather than displace her & lose track of her?

Please post any photos of the other species, then we may help you to determine which are a possible problem & which are harmless.